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Fault-first · measurement-first · board-level

Board-Level Welding Machine Repair Database

Start with the evidence you already have: a visible fault, a machine model, a board number or a controller IC. WelderData connects that entry point to the next safe measurement, circuit path, board reference and repair case.

Choose your repair starting point

Use the detail already in front of you. Each route narrows the next checks without forcing you through unrelated pages.

01

I know the fault

Start from no power, no output, protection, no HF, no wire feed or no pilot arc.

Open this route →02

I know the model

Open the machine family and find its boards, power rails, controller chips and common fault paths.

Open this route →03

I know the board or chip

Use a PCB function, controller IC or driver module as the starting point.

Open this route →04

Guide me through diagnosis

Follow a measurement order from power-off checks to controlled power-up.

Open this route →

Detailed repair references

Frequently used references with measurement order, fault branches, safety limits and technical sources.

Chip referenceUC3846 PWM controllerSupply, shutdown, current-sense and A/B output diagnosis.Auxiliary supply referenceKA3845 / UC3845 auxiliary supplyNo-start, VCC hiccup and missing-24V diagnosis.Chip referenceSG3525 PWM controllerOscillator, soft-start, shutdown and dual-output checks.Driver module referenceM57962AL IGBT driverDriver supply, fault output and gate-drive isolation.Model repair centerZX7-250 repair centerPower, control, driver and output fault references for the ZX7-250 family.Fault workflowIGBT keeps blowingPre-power checks before another power-device replacement.Plasma workflowPlasma no pilot arcAir, HF, pilot DC and transfer-feedback fault branches.Maintenance checklistPreventive maintenance checklistDaily through quarterly inspection and record workflow.

Common repair paths

Choose the symptom group that matches the machine, then follow the linked checks from first measurement to board-level diagnosis.

Power and startupAuxiliary powerNo power, VCC hiccup, missing 24 V and startup supply faults.Power stagePWM / gate drive / IGBTNo PWM, a missing gate branch, driver protection or repeated device failure.PlasmaPlasma pilot arcAir, HF, pilot DC, transfer and torch-path diagnosis.MIGMIG wire feedTrigger, control board, motor supply and speed-control faults.TIGTIG HF / AC-DCGas, high frequency, torch command and secondary-inverter faults.

Current database coverage

Published English repair references, excluding collection pages and pages queued for consolidation.

59model records
25fault records
128diagnostic workflows
96board and circuit references
13chip references
10repair cases